EP 0688769 B1 20000322 - Method of preparation of the 2-coumaranone
Title (en)
Method of preparation of the 2-coumaranone
Title (de)
Verfahren zur Herstellung von 2-Coumaranon
Title (fr)
Méthode de préparation de la 2-coumaranone
Publication
Application
Priority
FR 9407651 A 19940622
Abstract (en)
[origin: EP0688769A1] Prodn. of 2-coumaranone (I) is by: (1) vapour-phase reaction of glyoxylic acid (II) with cyclohexanone (III) in the presence of a dehydrogenation catalyst; (2) vapour-phase contacting a crude reaction mixt. with a dehydrogenation catalyst, the reaction mixt. being obtained by condensn. of (II) with (III) in known manner; or (3) vapour-phase contacting a cyclohexanone-2-acetic acid (IV) and/or cyclohexanol-2-acetic acid (V) soln. with a dehydrogenation catalyst. Carrier gas comprising N2 and/or H2 is used. Reaction temp. is at least 150 deg.C. Catalyst comprises Pd or Pt on inert support with surface area above 1 (esp. above 50) m2/g. In processes (1) and (2), soln. of (II) and (III) in HOAc or HOAc/H2O is used and by-produced (IV) and (V) are recycled.
IPC 1-7
IPC 8 full level
B01J 23/42 (2006.01); B01J 23/44 (2006.01); C07B 61/00 (2006.01); C07D 307/83 (2006.01)
CPC (source: EP US)
C07D 307/83 (2013.01 - EP US); Y02P 20/582 (2015.11 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0688769 A1 19951227; EP 0688769 B1 20000322; AT E190976 T1 20000415; CN 1059209 C 20001206; CN 1120540 A 19960417; DE 69515731 D1 20000427; DE 69515731 T2 20000706; ES 2143601 T3 20000516; FR 2721609 A1 19951229; FR 2721609 B1 19961004; JP 3746091 B2 20060215; JP H0812662 A 19960116; US 5616733 A 19970401
DOCDB simple family (application)
EP 95401385 A 19950614; AT 95401385 T 19950614; CN 95107010 A 19950621; DE 69515731 T 19950614; ES 95401385 T 19950614; FR 9407651 A 19940622; JP 17414995 A 19950616; US 47240095 A 19950607